Because to me it's absurd and he's not even saying shit to back up his claims. OP I see you and I hope you're using your other account to reply too. Funny human.
It was obvious right from the start of the thread that the Op will never return back to the thread, if he had the intention of returning he won't have created a new account just to post this thread on the forum.
You are right, this is exactly the same thought i had in mind when i first read the op, it is not possible for a newbie to just sign up and create such a thread as their first post, if i should guess, my guess would be that the real user who created this thread is either of a full member rank or senior member, if only the forum had a feature allowing users to view each other's ip addresss, maybe it would have been possible to find out who this user is if he or she is not using a VPN service.
As for creating this thread to know some merit source, I don't really think that's the reason. If you're observant enough and if you have stayed in the forum for sometime it will be very easy for you to spot those that are merit sources and if you use bpip.org to view the amount of merit sent by that profile you'll be able to note if that account is a merit source or not.
The only reason the must have triggered Op into creating this thread was probably his main account was stuck in a certain amount of merit for a long time and even after making several post he never got any single merit and that why he became butt-hurt.
Who or how does knowing who and who is a merit source help any user in the first place? finding out who a merit source is to either beg them for merit or attack them through pm or dm will only get such user sectioned with a temp or perma ban if the harassed user reports the case, so i see no way knowing who a merit source is benefits anyone including op, i very much go with your assumption of the op being stuck as a particular number of earned merit, that indeed can really annoying but still, is not enough to create a post as this.